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I Wayan Sutapa
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International Journal of Acta Material
Published by Universitas Halu Oleo
ISSN : -     EISSN : 30642396     DOI : https://doi.org/10.62749/ijactmat
Core Subject : Science,
Chemistry Materials Science & Nanotechnology Physics
The International Journal of Acta Material (Int. J. Act. Mat) is a bulletin for publishing original and complete papers, short communications as well as review results which aim to disseminate study results (Theoretical or Experiment) to explore of the relationship between processes, structures and properties of the frontier solid and liquid materials. The papers that have the potential for high impact and/or substantially advance the field will be sought. The process studied includes a series of material formation/manufacturing which will be achieved with the instrumentation used. The Journal also addresses a wide variety of subjects that are vital to the field, including but not limited to: Catalysis Material, Membrane Material, Solar cell, Condensed-matter physics, Electronics and device physics material, Absorbent Material, Green chemistry, Information theory and computation material, Nanomaterial, Polymer Material, Quantum physics and quantum technologies, Supramolecular material, Surface chemistry, Theoretical chemistry/physic solid material, Biofuel, Biomass Material.
Arjuna Subject : Ilmu Material (semua kategori) - Ilmu Material (Lain-Lain)
Articles 6 Documents
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Search results for , issue "Vol. 1 No. 2 (2025): February 2025" : 6 Documents clear
Microwave-Assisted Roasting-Leaching of Nickel from Indonesian Nickel Laterite Ore A. J. Muhammad; K. Nakagawa; I P. A. Karya; A. Ndita; L. O. M. Darusman; T. Iwamoto; Y. Terui; L. Agusu; I. N. Sudiana; F. Nishimura; T. Nishiumi; T. Asano; H. Kikuchi; S. Mitsudo
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.10

Abstract

This study investigated nickel extraction from nickel laterite ore from Indonesia using the microwave roasting leaching method. The study focused on investigating the effect of microwave power and roasting temperature on the extraction of nickel. Samples from each step were characterized using X-ray diffraction (XRD) and Atomic Absorption Spectroscopy (AAS). The method has the advantage of being carried out in atmospheric conditions with high nickel extraction at low temperatures, a rapid process, and without pre-roasting as in conventional roasting. It was obtained that 92.8% of nickel was extracted by application of microwave power at 540 W, at a roasting temperature of approximately 335°C for 30 minutes. The maximum result were obtained when the heating temperature is near to the boiling point of sulfuric acid (337oC). However, the amount of nickel extracted decreases when the heating temperature is above the boiling point of sulfuric acid. The results of XRD analysis of samples after roasting and solid leaching residue samples also revealed that the maximum nickel recovery occurred when the roasting process had transformed all iron sulfate-aqueous system (Fe(OH)(SO2)2.4H2O) into iron sulfate (Fe2(SO4)3) which also directly changed NiSO4.6H2O into NiSO4 which is highly soluble in water.
Green Synthesis of ZnO Nanoparticles from Henna Leaves (Lawsonia inermis L.) and their Characterization as Photosensitizer in Dye-sensitized Solar Cells W. S. Arsyad; F. S. Palobang; L Agusu; L. O. Rusman; I. Saleh; I N. Sudiana
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.11

Abstract

The green synthesis of ZnO nanoparticles from henna leaf extract and their characterization as photosensitizers in dye-sensitized solar cells was successfully conducted. The henna leaves were extracted with three different solvents specifically distilled water (A), ethanol (E), and methanol (M). The extracts were mixed with Zinc Acetate dihydrate (Znac) with different concentrations of (0.01, 0.02, and 0.03) M to form ZnO nanoparticles. The absorbance spectrum, functional groups, and crystal structure were analyzed using UV-Vis, FTIR, and XRD. UV-Vis analysis revealed the highest absorption peaks at 580.74 nm, 503.63 nm, and 501.36 nm for samples A, E, and M. The FTIR spectrum of henna leaves confirmed the presence of Lawsone, indicated by O-H, C-H, C=O, and C-O functional groups at 3411 cm⁻¹, 2926 cm⁻¹, 1585 cm⁻¹, and 1344 cm⁻¹, respectively. XRD analysis showed the largest crystallite size (76.5 nm) for the 0.03 M Znac sample in methanol (M3), and the smallest (35.7 nm) for the 0.02 M Znac sample in ethanol (E2). The smallest energy gap (Eg) of 2.16 eV was observed in the sample using distilled water (A) as the solvent for the pure extract, while the ZnO nanoparticles (E1) sample had an Eg of 2.57 eV. We found that henna extract and the resulting ZnO nanoparticles were suitable to be used as photosensitizers in DSSC
Analysis of Water Quality in Sea Waters After The Sea Snot Occurrence in Bima Bay West Nusa Tenggara S. Kasim; N. A. Pratiwi; H. Natsir; S. Liong; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.12

Abstract

The incident that occurred in April 2022 in Bima Bay was a phenomenon that shocked the residents of Bima City and outside the Bima area. Based on previous laboratory tests, the cause is Sea Snot which is accompanied by an explosion in the number and metabolism of algae. The entry of organic and inorganic pollutants into water bodies can cause water quality to experience degradation in biological function. This research aims to analyze water quality in marine waters with the parameters BOD, COD, DO, determine the Nitrate and Phosphate content and characterize total coliform and E. coli bacteria in marine waters. This research uses electrometric, photometric and membrane filtrate methods. pH ranged from 7.85 - 8.22; DO levels 5.97 - 6.15 mg / L, BOD 1.3, and 5 ranged from 5.52 - 9.06 mg / L. COD levels 15.62 - 21.44 mg / L. Nitrate ranges from 0.124 - 0.204 mg/L. Phosphate ranges from 0.27 - 0.41. Total coliform bacteria ranges from 706 - 1,266 colonies/100 mL and E. coli 0.75 - 1.75 colonies/100 mL. The water quality in the sea waters of Bima Bay has mostly met the sea water quality standards for the parameters BOD, DO, total coliform, E. coli , while the COD parameter is not included in the mandatory parameters which are one of the indicators of sea water pollution. The content of Nitrate and Phosphate in the waters of Bima Bay shows that its value has exceeded the sea water quality standards.
Effect of Ni Content Variation on the Synthesis of Nickel-Mobile Crystalline Material-41 (Ni-MCM-41) for Methylene Blue Adsorption L. O. Ahmad; H. Hidayat; A. Zaeni; F. Muhamad
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.13

Abstract

The research studied the enhancement of thermal resistance and the increase of adsorption capacity of methylene blue dye by Ni-doped mesoporous MCM-41 adsorbent (Ni-MCM-41). Ni-MCM41 were prepared using hydrothermal method with variation of Ni content ratio (Si/Ni = 10, 20, and 40). This study consisted of several stages including; preparation of 0.24 M sodium 1-heptansulphonate, nickel sulphate 0.025 M, 0.05 M and 0.1 M and 1 M sodium silicate solutions. Synthesis of Ni-MCM-41 which was characterized using FTIR, XRD, DSC and BET. The adsorption process experiments included the preparation of mother liquor and methylene blue standard solution, preparation of standard solution and determination of maximum wavelength, preparation of test solution, contact time variation and concentration variation. Wavelength, contact time variation and concentration variation were determined using UV-Vis spectrophotometer. Analyze the adsorption process by determining the percentage and maximum capacity of adsorption. As well as determining the type of adsorption that occurs through Freundlich and Langmuir adsorption isotherms. FTIR results showed wave numbers between 3400-3200 cm-1 indicating the presence of Si-OH groups, C-H group stretching vibrations at 2925 cm-1, asymmetric stretching vibrations of Si-O at 1239 cm-1, Si-O-Ni bending vibrations at 557 cm-1 and symmetric and asymmetric Si-O-Si stretching vibrations at 1081 cm-1. XRD showed the characteristic structure of MCM-41 with higher crystallinity obtained at Ni-MCM-41 ratio (Si/Ni=40), DSC showed greater thermal resistance of Ni-MCM-41 ratio (Si/Ni=40) at 175.13 oC. The adsorption capacity of methylene blue dye by MCM-41 and Ni-MCM-41 ratio (Si/Ni=40) were 4.0322 mg/g and 4.2735 mg/g, respectively, following Langmuir adsorption isotherm.
Mesoporous Silica (MCM-48) as an Adsorbent for Methylene Blue Dye P. Taba; Nariskawati; A. H. Kasim; I W. Sutapa
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.14

Abstract

Research on the synthesis of mesoporous silica (MCM-48) has been conducted, with the material being utilized as an adsorbent for methylene blue (MB) dyes. The synthesis of MCM-48 was performed via a hydrothermal method, employing Ludox HS40 as the silica source and a mixture of CTAB and Triton X-100 as the templating agents. The surfactants were subsequently removed through washing with HCl-ethanol. Characterization of the synthesized material was achieved using techniques such as X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Fourier Transform Infra-Red (FTIR) spectroscopy, and the Barrett-Joyner-Halenda (BJH) method. The MCM-48 materials utilized for MB adsorption included MCM-48 without prior washing (MCM-48-TC) and MCM-48 subjected to a single wash with HCl-ethanol (MCM-48-C1). Adsorption experiments for MB were conducted while varying the contact time to identify optimal conditions at neutral pH (6), and the adsorption capacity was assessed by performing adsorption at different concentrations under these optimal conditions. Isothermal adsorption was evaluated using the Langmuir and Freundlich isothermal models. The concentration of Methylene Blue post-adsorption was determined using a UV-Vis spectrophotometer at a wavelength of 660 nm. The results indicated that MCM-48 is an effective adsorbent for MB dye; the optimal adsorption time for MCM-48-TC was found to be 75 minutes, whereas for MCM-48-C1, it was 90 minutes. Adsorption by both MCM-48-TC and MCM-48-C1 conformed to the Freundlich isothermal model, with adsorption capacities of 1.4447 mg/g and 2.3900 mg/g, respectively.
Transesterification Reaction on Biodiesel Production from Bintaro Oil (Cerbera mangas L.) from Moluccas Island I W. Sutapa; A. Bandjar; H. Tehubijuluw; I. S. Ely; A. Kamari; C. Baskar; I N. Sudiana; L. O. Kadidae
International Journal of Acta Material Vol. 1 No. 2 (2025): February 2025
Publisher : Faculty Mathematics and Natural Sciences, Halu Oleo University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62749/ijactmat.v1i2.15

Abstract

Research on the conversion of bintaro seed oil (Cerbera manghas L.) into biodiesel has been conducted utilizing a KOH catalyst. The biodiesel synthesis involved two reaction stages: esterification and transesterification. The esterification process was executed with a 1.25% H2SO4 (1 M) catalyst, utilizing a methanol-to-oil ratio of 1:9, at a temperature range of 60-65°C for a duration of 2 hours. Following the separation of methanol and triglycerides, transesterification proceeded with a methanol ratio of 1:12, which had previously reacted with KOH catalyst at varying weight percentages of 0.2%, 0.3%, 0.5%, 1%, and 1.5%. The transesterification reaction was conducted over a period of 2 hours at a temperature of 60-65°C. The optimal weight percentage of KOH catalyst identified for the transesterification reaction in the synthesis of biodiesel from bintaro seed oil was determined to be 0.3% KOH catalyst. The resultant biodiesel was subsequently characterized using Fourier Transform Infrared Spectroscopy (FT-IR) and Gas Chromatography-Mass Spectrometry (GC-MS). Physical property tests of the biodiesel fuel, conducted in accordance with ASTM methods, yielded a specific density of 0.8878 g/cm³, a kinematic viscosity of 6 mm²/s, a flash point of 132.5°C, and a pour point of 9°C.

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